error[E0401]: can't use generic parameters from outer function
  --> $DIR/const-param-from-outer-fn.rs:6:9
   |
LL | fn foo<const X: u32>() {
   |              - const parameter from outer function
LL |     fn bar() -> u32 {
   |        --- try adding a local generic parameter in this method instead
LL |         X
   |         ^ use of generic parameter from outer function

warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/const-param-from-outer-fn.rs:1:12
   |
LL | #![feature(const_generics)]
   |            ^^^^^^^^^^^^^^
   |
   = note: `#[warn(incomplete_features)]` on by default
   = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0401`.